bug #11166 [Security] Fix stateless mention (tyx)

This PR was merged into the 4.2 branch.

Discussion
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[Security] Fix stateless mention

According to https://github.com/symfony/symfony/blob/5aa0967f9f0ab803ededefb040d48a0ebc7a27a6/src/Symfony/Component/Security/Guard/GuardAuthenticatorHandler.php#L43 Firewall of pure API should have `stateless` to `true`  in fact

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Commits
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2283cd2 Fix stateless mention

Author: wouterj

security/user_provider.rst

@@ -379,7 +379,7 @@ command will generate a nice skeleton to get you started::
          * called. Your job is to make sure the user's data is still fresh by,
          * for example, re-querying for fresh User data.
          *
-         * If your firewall is "stateless: false" (for a pure API), this
+         * If your firewall is "stateless: true" (for a pure API), this
          * method is not called.
          *
          * @return UserInterface